[Bug 1978521] brltty crashed with SIGSEGV in runSpeechDriverThread()

[Apport retracing service]

StacktraceTop:
 asyncDiscardEvent (event=0x0) at ../../Programs/async_event.c:147
 runSpeechDriverThread (argument=0x5642f4c2b890) at ../../Programs/spk_thread.c:842
 runThread (argument=0x5642f4c2bb80) at ../../Programs/thread.c:46
 start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:442
 clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

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https://bugs.launchpad.net/bugs/1978521

Title:
  brltty crashed with SIGSEGV in asyncDiscardEvent()

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